Answer:

<em>Correct option B.</em>
Step-by-step explanation:
The diagram shows a trapezoid with a base angle of 45° and the other base angle of 90°.
We have completed the diagram to draw a perpendicular line over the base of height h=4. A triangle is formed with an angle of 45°.
Recall a right triangle with angles of 45° is isosceles, thus the base and the height are h=4. Please check the diagram below.
For that triangle, we apply Pythagora's Theorem:

Thus:


The base of the trapezoid x is h + 3 = 7
Thus:

Correct option B.
The y intercept will be at (0,9), the slope will be -1/1, which means go right one, down one. Draw the line connecting the points and then arrows on either side of the line.
Answer: x = -2
Step-by-step explanation:---------------